Basic Properties of Polylactic Acid Produced by the Direct Condensation Polymerization of Lactic Acid

1995 ◽  
Vol 68 (8) ◽  
pp. 2125-2131 ◽  
Author(s):  
Masanobu Ajioka ◽  
Katashi Enomoto ◽  
Kazuhiko Suzuki ◽  
Akihiro Yamaguchi
Keyword(s):  
Lactic Acid ◽  
Polylactic Acid ◽  
Condensation Polymerization ◽  
Basic Properties ◽  
Direct Condensation

Direct condensation polymerization of lactic acid

1999 ◽  
Vol 144 (1) ◽  
pp. 277-287 ◽  
Author(s):  
Soo Hyun Kim ◽  
Young Ha Kim
Keyword(s):  
Lactic Acid ◽  
Condensation Polymerization ◽  
Direct Condensation

scholarly journals Cyclic Oligolactic Acid in Direct Polycondensation PLLA and Its Extraction with Organic Solvent

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Keiichiro Nomura ◽  
Yuta Nakatsuchi ◽  
Ryugo Shinmura ◽  
Sommai Pivsa-Art ◽  
Weraporn Pivsa-Art ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Lactic Acid ◽  
Selective Extraction ◽  
Condensation Polymerization ◽  
Direct Polycondensation ◽  
H Nmr ◽  
Repeat Units ◽  
Molecular Inclusion ◽  
Cyclic Compounds ◽  
Direct Condensation

The contents of poly(L-lactic acid) (PLLA) prepared by direct condensation polymerization without using a catalyst were studied. 1H NMR and mass spectrometry analyses suggested that PLLA contained cyclic oligo(L-lactic acid) (c-OLLA) with 3–20 repeat units. Notably, only c-OLLA was extracted and isolated using hexane or cyclohexane at 4°C; thus the hydrophobicity, topology, and temperature dependence of the solubility of the obtained PLLA enabled the selective extraction of c-OLLA. The effect of cyclic compounds on direct polycondensation and the potential for c-OLLA to form molecular inclusion complexes were also discussed.

Direct Condensation Polymerization of L-Lactic Acid Catalyzed by Distannoxane

1996 ◽  
Vol 25 (3) ◽  
pp. 225-226 ◽  
Author(s):  
Junzo Otera ◽  
Kazuko Kawada ◽  
Toru Yano
Keyword(s):  
Lactic Acid ◽  
Condensation Polymerization ◽  
Acid Catalyzed ◽  
Direct Condensation

scholarly journals Direct condensation polymerization of N-alkylated p-aminobenzoic acid and packing of rigid-rod main chains with flexible side chains

2010 ◽  
Vol 42 (1) ◽  
pp. 72-80 ◽  
Author(s):  
Yuji Shibasaki ◽  
Yoko Abe ◽  
Natsuki Sato ◽  
Atsuhiro Fujimori ◽  
Yoshiyuki Oishi
Keyword(s):  
Side Chains ◽  
Condensation Polymerization ◽  
Aminobenzoic Acid ◽  
Rigid Rod ◽  
Direct Condensation

scholarly journals Effects of synthesised polyaniline (PAni) contents on the anti-static properties of PAni-based polylactic acid (PLA) films

RSC Advances ◽  
2020 ◽  
Vol 10 (65) ◽  
pp. 39693-39699
Author(s):  
Pei-Yi Wong ◽  
Sook-Wai Phang ◽  
Azizah Baharum
Keyword(s):  
Lactic Acid ◽  
Polymer Film ◽  
Polylactic Acid ◽  
Poly Lactic Acid ◽  
Static Properties ◽  
Biodegradable Poly

An anti-static polymer film was prepared using biodegradable poly(lactic acid) as a matrix and polyaniline (PAni) as an anti-static agent to eliminate accumulated static charges.

scholarly journals Uncatalysed Polycondensation of Lactic Acid to Polylactic Acid Under Microwave Irradiation: Effect of Microwave Power

2020 ◽  
Vol 1551 ◽  
pp. 012001
Author(s):  
S. M. Shahrul Nizan Shikh Zahari ◽  
Muhammad Humaidi Mansor ◽  
Hazeeq Hazwan Azman ◽  
Dzulfadli Rosli
Keyword(s):  
Lactic Acid ◽  
Microwave Irradiation ◽  
Polylactic Acid ◽  
Microwave Power ◽  
Irradiation Effect

Synthesis of Poly(D,L-Lactic Acid-Co-Glucose) via Direct Polycondensation and its Characterization

2011 ◽  
Vol 80-81 ◽  
pp. 370-374 ◽  
Author(s):  
Shi He Luo ◽  
Zhao Yang Wang ◽  
Dong Na Huang ◽  
Chao Xu Mao ◽  
Jin Feng Xiong
Keyword(s):  
Drug Delivery ◽  
Lactic Acid ◽  
Polylactic Acid ◽  
1H Nmr ◽  
Biodegradable Material ◽  
Direct Polycondensation ◽  
Carrier Material ◽  
Melt Polymerization ◽  
Drug Delivery Carrier ◽  
Melt Polycondensation

Directly using cheap D,L-lactic acid (D,L-LA) and glucose (Glu) as starting materials, biodegradable material poly(D,L-lactic acid-co-Glucose) [P(D,L-LA-co-Glu)] was synthesized via melt polycondensation. When n(Glu) : n(D,L-LA) = 1:200, the appropriate synthetic condition is that: after 120 °C prepolymerization for 5 h, 160 °C melt polymerization catalyzed by w(SnCl2) = 0.5% for 5 h. P(D,L-LA-co-Glu) with different molar feed ratios were synthesized and characterized with [η], FTIR, 1H NMR, GPC and XRD. The Tg of all copolymer P(D,L-LA-co-Glu) was lower than that of homopolymer polylactic acid directly synthesized via melt polycondensation. The copolymers with Mw from 2,100 Da to 5,100 Da could meet the demand of drug delivery carrier material.

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